[Elecraft] Can there be a delay before xmit after pressing the XMIT button on my K3?

[Edward R Cole]

Yes (but read more):

I am using a Down East Microwave sequencer with my K3/10 (mainly on 
VHF with transverters but it will work for any band - keep 
reading).  I use the INHIBIT command in the CONFIG menu to keep the 
K3 from transmitting until the sequencer says: "OK".  The sequencer 
goes thru four timed sequences (from Rx, to switching TR relays, to 
enabling external amps, to defeating inhibit as last step).  I 
control the sequencer with the K3 KEY OUT line.

If you push XMIT, KEY OUT goes low to key the sequencer while the 
INHIBIT keeps the transmitter from outputting RF.  You have two 
choices INHIBIT HI or LO and that will depend on what your sequencer 
can provide.  I use HI and the sequencer pulls it LO to enable RF 
output.  To use this you need to read over use of INHIBIT function 
and use of pin-7 of the ACC jack.

I am not as familiar with what the Signal Link can do.  What input 
control it needs and what output keying it can do.  But if it uses 
typical PTT LO for both then the method I have shown should work.  Be 
sure to test into a dummy load before connecting to real equipment to 
ensure you got it right when setting this up!

I use the TRN lines to control my INHIBIT on VHF but I suspect you 
can use CONFIG: K103 - NOR on HF bands if that is where you need to 
use this.  I do not use it on HF.  I added sequencer operation on 6m 
by using the output of DIGOUT-1.

If you need more help e-mail me direct.
73 & Happy Holidays!, Ed - KL7UW


-------------------
Date: Thu, 19 Dec 2013 11:12:20 -0500
From: KD7YZ Bob <kd7yz at denstarfarm.us>
To: K3 List <elecraft at mailman.qth.net>
Subject: [Elecraft] Can there be a delay before xmit after pressing
         the XMIT        button on my K3?
Message-ID: <653269617.20131219111220 at denstarfarm.us>
Content-Type: text/plain; charset=us-ascii

Howdy K3' people:

I use a sequencer which helps ensure that RF does not flow from the K3
before a sensitive LNA is switched out of the RF path.

This works if a foot-switch is pressed here. It  works when the
Tigertronics "SignaLink USB" closes the sequencer's PTT  input.

However, the K3's "XMIT" button will key the rig and I see no wy to have
that action tell the Sequencer that it's internal PTT needs activation.
This would need doing prior do RF flowing.

If there was a way that a delay could be chosen/set to follow the
pressing of XMIT button then I might try using the K3 PTT out or the
XV144 Key-Out.

I would like to think I will not press the K3 XMIT button but that "ain't
gonna happen" as I am likely to use "XMIT" with a reduced output to tune
an external 2m PA .

Or, sometimes I am just stupid and press XMIT anyway ... wouldn't be
nice to destroy an expensive LNA ..... especially in the middle of a
QSO with a severely weak station.

-- 
73
KD7YZ Bob


73, Ed - KL7UW
http://www.kl7uw.com
dubususa at gmail.com
"Kits made by KL7UW"